A bulk materials hauler purchased a used dump truck for $50,000 two years ago. The operating costs have been $5000 per month and revenues have averaged $7500 per month. The truck was just sold for $11,000. The rate of return is closest to: (a) 2.6% per month (b) 2.6% per year (c) 3.6% per month (d) 15.6% per year

A consulting engineering firm is considering two models of SUVs for the company principals. A GM model will have a first cost of $36,000, an operating cost of $4000, and a salvage value of $15,000 after 3 years. A Ford model will have a first cost of $32,000, an operating cost of $3100, and also have a $15,000 resale value, but after 4 years. (a) At an interest rate of 15% per year, which model should the consulting firm buy? Conduct an annual worth analysis. (b) What are the PW values for each vehicle? 10 16 -22)

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A solid waste disposal company borrowed money at 10% per year interest to purchase new equipment needed. If the company got the loan 2 years ago and paid it off with a single payment of $4,600,000, a) Identify the engineering economy symbols and their values (PW, FW, i%, n) b) Draw the cash flow c) Calculate the principal amount P of the loan